Projection screen board

The invention provides a projection screen board which comprises a left outer shell and a right outer shell, a foldable supporting rod, a left screen center pipe, a right screen center pipe, a screen face and a lock catch. The left outer shell and the right outer shell are oppositely arranged, the bottom end of the left outer shell and the bottom end of the right outer shell are provided with bases respectively, foldable supporting feet are arranged on the bases on the two sides, the foldable supporting rod comprises a first short supporting rod, a second short supporting rod, a first long supporting rod and a second long supporting rod, the left screen center pipe and the second screen center pipe are contained in the left outer shell and the right outer shell respectively, the two ends of the screen face are wound on the left screen center pipe and the right screen center pipe respectively, the lock catch comprises a left lock base and a right lock base, and the left lock base and the right lock base can be matched with each other and are arranged on the left outer shell and the right outer shell respectively. The projection screen board can be folded and is accordingly convenient to carry, and when being not used, the projection screen board can be folded to be stored without occupying extra space.